crossley



June 12, 1923.

A. CROSSLEY ANTENNA SELECTOR SWITCH Filed July '7, 1919 2 Sheets-Sheet 1 June 12, 1923.

Filed July '7, 1919 2 Sheets-Sheet 2 Patented June 12, 1923.

UNITED STATES PATENT OFFICE.

ANTENNA SELECTOIt SWITCH.

Application filed July 7,

To wlwmitmay concern:

e it known that I, ALFRED C'nossnnr', a citizen of the United States, at present stationed at the Bureau of Steam Engineering, Navy Department, Washington, D. 0., have invented an Improvement in Antennae Selector Switches, of which the following is as ecification. I

y invention relates broadly to underground radio receiving systems and more particularly to a switching device for use as a selector to connect various combinations of antennae to the radio receiving apparatus for directive reception.

The object of my invention is to provide 2 a. practical selector switch capable of rapid manipulation to connect various combina-' tions of underground, elevated or loop antennae to the receivin apparatus.

Another object of t e invention is to provide in an antennae switch construction means for insurin perfect electrical contact of the switch e ements.

My invention will be understood by ref; erence to the accompanying drawings which form a part of this specification and in which like reference characters have been used to indicate like parts throughout the several views.

Figure 1 isa front elevation of the antennaa selector switch. Figure 2 is a cross section of the switch shown in Figure 1. Fi re 3 is. schematic wiring diagram of the switch and associated circuits.

Referring particularly to Figure 1. the selector switch comprises case 1 having binding posts 2 and 3 secured to the to section 4 of insulating material. The bin ing posts connect to terminals 5 and 6 of rotary switch blades 7 and 8 through wires 2 and 3. The rotary switch blade 7 is se cured to insulating handle 9 substantially insulated and operative against the thrust of coil sprin 10. The coil spring 10 acts between sho der 11 of handle 9 and screw head 12 of member 14 secured to the inside of top anel, 4 by flange 15 and suitable screws or example as shown at 6.

The member 14 is rovided with flange 16 adapted to seat against insulated washer 17 recessed in collar 18. The collar 18 is secured to the panel 4 and forms a continuous beari surface for switch blade 7.

The switc blade 8 is secured to insulated 1919. Serial 1T0. 809,173.

handle 19 having shaft 20 concentric with= v in member 14 and retained in position by means. of coil spring 21 and tension screw 22. Screw 6 which is a part of member 14 forms the terminal for switch blade 8 and suitable securing screws connected to collar 18form the terminal for switch blade 7.

The switch blades 7 and 8 are arranged to rotate .concentrically and are free to pass each other over a series of contact points 24. The contacts 24 are so related that the switch blades are capable of contacting with one or two points at the same time. The switch contacts are arran ed in roups of four marked as indicated E, S, W and N designating easti, south, west and north, and connected as shown in Figure 3.

In the diagram Figure 3, I have shown a combinationantennae system associated with the selector switch of Figures 1 and 2. The antennae leads from the contact points of the switch are connected to antennae positioned as indicated at the four points of the compass. The antennae proposed in this case are underground cables, but it will be understood that any type of antennae ma be connected to the contacts of the switc by use of additional contact points in order to afford a great variety of combinations of antenna; with the receiving apparatus. In each direction of the compass three underground ante'nnae are positioned having different natural periods say for example 600, 952, and 1600 meters respectively. The

switch contacts are designated by groups for the wave length of 600, 952, and 1600 meters and the individual contacts marked as previously described with letters showing the points of the compass.

The contact 24' is grounded at 25 and may form one connection to the primary circuit of radio receiving ap aratu's. 26 through switch blade 8 termina 6 wire 3 and binding post 3. The other side of the primary circuit being connected thru binding post 2, wire 2 terminal 5 and switch blade 7 to the underground antennae having a period of 952 meters positioned in a norther y direction. By chan 'ng the position of switch blades 7 and 8 t e radio receiving apparatus 26 may be connected to an selected antennae forreception of signa s in the articular direction desired.

e selector switch described has proven highly successful in an underground antennae installation in the Naval Operating Base, Hampton Roads, Virginia.

What I claim and desire to secure by Letters Patent of the United States is:

1. In combination a plurality of groups of independent directional collectors of radio signals, the collectors of each group having different wave length characteristics but having the same direction, and a rotary selector switch having contacts to which the collectors are connected, the said contacts being grouped and marked to indicate the directional and wave length characteristics of the collectors.

2. In combination a plurality of groups of independent directlonal collectors of radio energy; the collectors of each group having different characteristics but having the same direction, a ground connection, and a rotary selector switch adapted to combine a selected collector or collectors and ground to constitute a complete antenna, substantially as 7 described; V

. ALFRED OROSSLEY. 

